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Page 2 | AlliedWare™ OS How To Note: VPNs with Windows 2000 clients, without NAT-T
This document describes how to configure the Windows system to use IPSec VPN to connect
to your office through the AR4
1
5S router.
When your staff want to connect to the office they simply use the VPN icon on their desktop to
initiate the IPSec VPN connection.
Which products and releases does it apply to?
The following Allied Telesis routers are most suitable as VPN gateways because they have fast
hardware encryption support and high performance:
z AR4
1
5S, AR44xS series, and AR450S
z AR750S and AR770S
The AR4
1
5S achieves up to 90 Mbps throughput with 3DES or AES encryption.
You can also use older routers as VPN gateways, but they will not have as high performance. The
older routers depend on either the Encryption Mini Accelerator Card (EMAC) or the
Encryption PCI Accelerator Card (EPAC) to perform encryption. They include:
z AR725, AR745, AR720 and AR740 routers
z AR4
1
0 series routers
z AR300 series routers
Finally, you can also use the Rapier 24 and Rapier 24i switches as VPN gateways, but this is
usually not a recommended practice. Doing so means you will lose wire-speed switching of data,
because all traffic needs to be inspected by the firewall and IPSec at CPU processing speed.
Encryption algorithms such as 3DES and AES require a feature licence. This is included on some
models. See your Allied Telesis representative for more information.
The configuration is supported on all AlliedWare versions since 2.3.
1
and was tested using a PC
running Microsoft Windows 2000 Professional, Service Pack 4.
Related How To Notes
Allied Telesis offers How To Notes with a wide range of VPN solutions, from quick and simple
solutions for connecting home and remote offices, to advanced multi-feature setups. Notes also
describe how to create a VPN between an Allied Telesis router and equipment from a number of
other vendors.
For a complete list of VPN How To Notes, see the Overview of VPN Solutions in How To Notes in
the How To Library at www.alliedtelesis.com/resources/literature/howto.aspx.
The collection includes Notes that describe how to interoperate with Windows 2000, XP and
Vista clients.